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Question:

DC motor speed control performance is very good, why do we need AC motor?

DC motor speed control performance is very good, why do we need AC motor?

Answer:

A DC power supply, DC motor needs a high power, AC motor is not required; two, brush DC motor system belongs to the mechanical friction, need regular maintenance (replacement cleaning brush, commutator), AC motor is not these; three is, carbon brush spark will cause electromagnetic interference to the extensive use of electronic systems the four is the same; DC motor power, the volume ratio of AC motor; five, AC converter now has been very mature, can meet most of the requirements of speed.
AC motor: a machine used to convert mechanical energy and alternating current energy. AC motor has become the most common motor because of the great development of AC power system. Compared to the AC motor and DC motor, because there is no commutator (see DC motor commutation), therefore has the advantages of simple structure, convenient manufacture, relatively strong, easy to make high speed motor, high voltage, high current, large capacity. The coverage of AC motor power greatly, from a few watts to several 101000 watts, even millions of kilowatts.
Machine current (direct) is a rotating electric machine that converts DC energy into mechanical energy (DC motor) or converts mechanical energy into direct current power (direct current generator). The utility model is an electric motor which can realize the conversion between the direct current energy and the mechanical energy. When it is used as an electric motor, it is a DC motor. It converts the electric energy into mechanical energy. When the generator is running, it is a DC generator and converts mechanical energy into electrical energy.
Because the DC motor needs a set of high-power DC power supply, the AC motor doesn't need it.

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